Rod-packing.



' No. 632,638. Patented Sept. 5, I899:

F. BROWN.

ROD PACKING.

{Application filed Mar. 27, 1899.!

(No Model.)

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u: NORRIS mans co. Pnb'rd-uwu. wnsm UNITED STATES PATENT OFFICE.

FRANKLIN BRONN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE JAMESSMITH & COMPANY, INCORPORATED, OF SAME PLACE AND CHARLESTON, WESTVIRGINIA.

ROD-PACKING.

SPECIFICATION forming part of Letters Patent No. 632,638, datedSeptember 5, 1899.

Application filed March 27,1899. Serial No. 710,680. (No model.)

following is a specification.

The object of my invention is to so construct a packing for piston-rods,valve-rods,

and the like that the same canbe readily kept tight and theindividuality of the successive rings of the packing will be preserved,so that the capacity of the same for adjustment independent of eachother to compensate for wear will not be interfered with. This object Iattain in the manner hereinafter set forth, reference being had to theaccompanying drawings, in whioh Figure l is a sectional View of part ofa piston or valve rod with the ordinary stuffingboX and its follower andwith packing constructed in accordance with my invention, the packingbeing shown in the uncompressed form as it appears when first introducedinto the stuffing-box; and Fig. 2 is a view similar to Fig. 1, butshowing the packing compressed as it appears after it has been used forsome time.

In the drawings, 1 represents part of a piston or valve rod, 2 part ofthe stuffing-box, and 3 the usual follower whereby the packing iscompressed in said stuffing-box. In the present instance I have shownpacking consisting of two rings, each comprising an inner portioncomposed of rings of triangular cross-section 4c 4 and 5 5, disposedpoint to point and contained within a braided or other fibrous wrappingor cover 6 and an outer arch-shaped casing or inclosure 7, which ispreferably composed of alternate layers of rubber and textile fabricsimilar to ordinary fire-hose and is open on the side toward the rod,this casing being contained within a braided or other fibrous covering8.

The rings 4: of the inner packing are preferably composed ofcomparatively unyielding textile material, while the rings 5 are of morecompressible material and the whole is thoroughly saturated withlubricating material of any desired character.

When the arch-shaped casings of the packing are subjected to thepressure of the follower, they are flattened and compressed, as shown inFig. 2, thereby imparting pressure to the rings 5 of the internalpacking and causing the latter to force apart the rings 4, the innerrings being pressed firmly against the rod, so as to insure a tightjoint, and the attainment of this result being'aided by the pressure ofthe inner edges of the casings 7 upon the rod on each side of the ring4:.

The casings 7 serve to preserve the individuality of the inner masses ofpacking and insure the wedge-like or expansive action of the same untilthe packing is worn out, thus overcoming an objection to packing inwhich the wedge-like bodies alone are employed, as such packing underthe pressure of the follower 3 is soon reduced to a common mass in whichthe identity of the wedges is lost.

I am aware that it has been proposed to confine a mass of lubricatingmaterial in a section of lead or other soft-metal pipe, forming anarch-like covering, and therefore I lay no claim to such invention, myinvention being distinct from this in that the inner body of the packingis especially constructed to have a wedge-like or expansive action,andthe outer body or casing is of material possessing elasticity, so thatit will exert an elastic pressure upon the inner contained body of thepacking and will itself be expanded so as to bear upon the rod, therebymaterially lessening the pressure upon the follower necessary toproperly packthe rod.

I am also aware that it has been proposed to make rod-packing rings ofrubber grooved or recessed on the face next to the rod and havingfibrous packing in such groove or recess, but this also lacks thewedge-expansion features of my packing, and the rubber is not as good amedium to impart pressure as my arch-like casing composed of rubber andtextile material. Moreover, the rubber casing of said previous packinghad no bearing upon the rod, as in my case.

Having thus described my invention, I claim and desire to secure byLetters Patent 1. Rod-packing consisting of an inner body having ringsof triangular cross-section disposed so as to be forced apart bypressure exerted in the direction of the length of the 5 rod and anouter casing of elastic material containing said inner body but open onthe side toward the rod, substantially as specified.

2. Rod-packing consisting of an inner body composed of rings oftriangular cross-section 10 disposed point to point, and an outer casingof elastic material containing the same but open on the side toward therod, substantially as specified.

3. Rod-packin g consisting of an inner body 15 having rings oftriangular cross-section disposed so as to be forced apart bypressureexerted in the direction of the length of the rod, and an outer casingof elastic material containing said inner body but open on the sidetoward the rod, and having a bearing on 20 the rod, on each side of saidinner packing, substantially as specified. a

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FRANKLIN BROWN.

Witnesses:

F. E. BEon'roLn, J 0s. H. KLEIN.

